Buoyancy (Weight of a barbell underwater)

[wallace13]

A bodybuilder is holding a 20-kg steel barbell above her head. How much force would she have to exert if the barbell were lifted underwater?Fb= Density x Volume x Gravity
Density= mass/volume
7860= 20/ V

V= .00254 m^3
Fb= 1000 x .00245 x 9.81
Fb= 24.9174 N

 

[Doc Al]

You've found the buoyant force, which is the force exerted by the water. But what's the force that she has to exert?

 

[amd123]

I've never done this type of problem wouldn't it just be mass*bouancy force 24.917 * 20 kg =498.35N